One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,4)(3,7,8,6)(9,10,13,16)(11,14,18,22)(12,15,20,24)(17,21,19,23)(25,26,30,34)(27,35,36,47)(28,32,42,50)(29,43,44,33)(31,38,45,39)(37,51,52,56)(40,49,41,48)(46,54,55,53)(1,3,5,8)(2,6,4,7)(9,11)(10,14)(12,19)(13,18)(15,23)(16,22)(17,20)(21,24)(27,36)(31,45)(35,47)(37,52)(38,39)(46,55)(51,56)(53,54)(1,2,5,4)(3,6,8,7)(9,12)(10,15)(11,17)(13,20)(14,21)(16,24)(18,19)(22,23)(25,27,29,39,30,36,44,38)(26,31,33,35,34,45,43,47)(28,37,41,53,42,52,40,54)(32,46,49,51,50,55,48,56)(1,2,5,4)(3,7,8,6)(12,20)(15,24)(17,19)(21,23)(25,28,30,42)(26,32,34,50)(27,37,36,52)(29,41,44,40)(31,46,45,55)(33,49,43,48)(35,51,47,56)(38,54,39,53)(1,4,5,2)(3,7,8,6)(10,16)(11,18)(15,24)(17,19)(25,29,30,44)(26,33,34,43)(27,38,36,39)(28,40,42,41)(31,47,45,35)(32,48,50,49)(37,53,52,54)(46,51,55,56)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.